package com.doyens.controller;


import com.doyens.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;
    /*
     文件上传
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
      //file是一个临时文件,需要转存到指定位置,否则本次请求后临时文件会删除
        log.info(file.toString());

        //重命名上传上来的图片名字
        String originalFilename = file.getOriginalFilename();//abc   .jpg
        String suffix = originalFilename.substring(originalFilename.lastIndexOf(".")); //.jpg

        //采用uuid进行重命名文件
        String fileName = UUID.randomUUID().toString() + suffix; // asdfwr234we-werdfwesr-sdfsdf.jpg

        //判断目录是否存在
        File dir = new File(basePath);
        //判断
        if (!dir.exists()){
            dir.mkdir();//重新创建目录
        }




        //将文件存储到指定位置
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }


        return R.success(fileName);
    }

    /**
     * 文件的下载
     *
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        //输入流,通过输入流读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream((new File(basePath + name)));
            //输出流, 通过输出流讲文件写回浏览器,在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");//设置头文件
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) !=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();//刷新
            }
            //关闭流
            outputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
